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st: Re: oglm program now available at ssc
Interestingly, though McCullagh typically gets credit for the ordinal
regression model, McKelvey and Zavoina originally described it five
years earlier in a 1975 article in J. Math. Sociology, which
McCullagh apparently did not know about. I don't recall, however,
that M and Z consider the idea of different links.
Date: Fri, 20 Jan 2006 04:33:06 -0600
From: Phil Schumm <email@example.com>
Subject: Re: st: oglm program now available at ssc
I think it's worth noting here that PLUM was originally a program
written by Peter McCullagh, whose 1980 paper (Regression Models for
Ordinal Data, JRSS, B 42, 109-142) laid out much of the foundation
for ordinal regression models.
I once asked someone in tech support at SPSS about the basis of their
PLUM procedure, and s/he said that it was based closely on
McCullagh's 1980 paper. As has been noted elsewhere, though, SPSS may
have slipped regarding conventional naming of the complementary
log-log link as described in McCullagh.
I have no idea how SPSS came by this,
or whether their implementation bears any resemblance to the original.
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